Terahertz source quantum cascade laser is a semiconductor laser based on quantum well structure, which can emit electromagnetic waves in the terahertz band.

Functional Characteristics Analysis of Terahertz Source Quantum Cascade Laser:

1. High power and high efficiency

Peak power:

The output power of continuous wave (CW) mode can reach tens to hundreds of milliwatts, and the peak power of pulse mode can reach the watt level.

Electro optic conversion efficiency:

After optimizing doping and resonant tunneling design, the efficiency can reach 10% to 20% (far exceeding traditional terahertz light sources such as backward wave tubes).

2. Frequency tunability

Temperature tuning:

By changing the device temperature and adjusting the quantum well energy level spacing, a frequency tuning range of 10% to 20% can be achieved.

Voltage tuning:

By injecting current or applying an external electric field to regulate the band structure, the frequency can be continuously tuned.

3. High coherence and narrow linewidth

Coherence length:

The coherence length of single-mode output can reach the meter level, suitable for terahertz interference imaging or spectral analysis.

Line width control:

The DFB structure can narrow the linewidth to the kHz level, improving spectral purity.

4. High speed modulation capability

Direct current modulation:

The response bandwidth reaches the GHz level and supports terahertz wireless communication with high-speed signals.

External modulation:

After integrating the electroabsorbent modulator, a modulation bandwidth of>10 GHz can be achieved.

5. Wide spectral coverage

Frequency range:

Covering 0.5-5 THz (can be extended to over 10 THz through material design and process optimization).

Multi wavelength output:

By coupling multiple active regions or gratings, dual wavelength or multi wavelength simultaneous output can be achieved.

Key technological advantages of terahertz source quantum cascade laser:

1. Compact and portable

Volume and weight:

The typical device size is only a few millimeters square and can be integrated into handheld devices or unmanned aerial vehicle platforms.

Low power consumption:

The driving voltage is usually several volts to tens of volts, and the current is less than 1 A, which is suitable for battery powered scenarios.

2. Strong environmental adaptability

Temperature stability:

Through heat sink design (such as diamond heat sink) and active temperature control, it can operate stably in an environment of -40 ° C~80 ° C.

Vibration resistance performance:

All solid state structure, no mechanical vibration components, suitable for vehicle or aerospace applications.

3. Multi functional integration potential

Integration of sensing and communication:

The same chip can integrate transmission, reception, and signal processing circuits for terahertz radar or security detection.

System on Chip Integration (SoC):

Combining CMOS technology to achieve single-chip integration of terahertz light sources, detectors, and signal processing circuits.